Collapse bounds calculations into DisplayListBuilder (flutter#34365)

* Collapse bounds calculations into DisplayListBuilder

* Tweak code

* Remove bounds cull

* Remove obsolete comment

Author: ColdPaleLight

display_list/display_list.cc

@@ -5,9 +5,9 @@
 #include <type_traits>
 
 #include "flutter/display_list/display_list.h"
+#include "flutter/display_list/display_list_builder.h"
 #include "flutter/display_list/display_list_canvas_dispatcher.h"
 #include "flutter/display_list/display_list_ops.h"
-#include "flutter/display_list/display_list_utils.h"
 #include "flutter/fml/trace_event.h"
 
 namespace flutter {
@@ -23,24 +23,24 @@ DisplayList::DisplayList()
       nested_op_count_(0),
       unique_id_(0),
       bounds_({0, 0, 0, 0}),
-      bounds_cull_({0, 0, 0, 0}),
       can_apply_group_opacity_(true) {}
 
 DisplayList::DisplayList(uint8_t* ptr,
                          size_t byte_count,
                          unsigned int op_count,
                          size_t nested_byte_count,
                          unsigned int nested_op_count,
-                         const SkRect& cull_rect,
-                         bool can_apply_group_opacity)
+                         const SkRect& bounds,
+                         bool can_apply_group_opacity,
+                         sk_sp<const DlRTree> rtree)
     : storage_(ptr),
       byte_count_(byte_count),
       op_count_(op_count),
       nested_byte_count_(nested_byte_count),
       nested_op_count_(nested_op_count),
-      bounds_({0, 0, -1, -1}),
-      bounds_cull_(cull_rect),
-      can_apply_group_opacity_(can_apply_group_opacity) {
+      bounds_(bounds),
+      can_apply_group_opacity_(can_apply_group_opacity),
+      rtree_(std::move(rtree)) {
   static std::atomic<uint32_t> next_id{1};
   do {
     unique_id_ = next_id.fetch_add(+1, std::memory_order_relaxed);
@@ -52,26 +52,6 @@ DisplayList::~DisplayList() {
   DisposeOps(ptr, ptr + byte_count_);
 }
 
-void DisplayList::ComputeBounds() {
-  RectBoundsAccumulator accumulator;
-  DisplayListBoundsCalculator calculator(accumulator, &bounds_cull_);
-  Dispatch(calculator);
-  if (calculator.is_unbounded()) {
-    FML_LOG(INFO) << "returning partial bounds for unbounded DisplayList";
-  }
-  bounds_ = accumulator.bounds();
-}
-
-void DisplayList::ComputeRTree() {
-  RTreeBoundsAccumulator accumulator;
-  DisplayListBoundsCalculator calculator(accumulator, &bounds_cull_);
-  Dispatch(calculator);
-  if (calculator.is_unbounded()) {
-    FML_LOG(INFO) << "returning partial rtree for unbounded DisplayList";
-  }
-  rtree_ = accumulator.rtree();
-}
-
 void DisplayList::Dispatch(Dispatcher& dispatcher,
                            uint8_t* ptr,
                            uint8_t* end) const {

display_list/display_list.h

@@ -248,21 +248,9 @@ class DisplayList : public SkRefCnt {
 
   uint32_t unique_id() const { return unique_id_; }
 
-  const SkRect& bounds() {
-    if (bounds_.width() < 0.0) {
-      // ComputeBounds() will leave the variable with a
-      // non-negative width and height
-      ComputeBounds();
-    }
-    return bounds_;
-  }
+  const SkRect& bounds() { return bounds_; }
 
-  sk_sp<const DlRTree> rtree() {
-    if (!rtree_) {
-      ComputeRTree();
-    }
-    return rtree_;
-  }
+  sk_sp<const DlRTree> rtree() { return rtree_; }
 
   bool Equals(const DisplayList* other) const;
   bool Equals(const DisplayList& other) const { return Equals(&other); }
@@ -280,8 +268,9 @@ class DisplayList : public SkRefCnt {
               unsigned int op_count,
               size_t nested_byte_count,
               unsigned int nested_op_count,
-              const SkRect& cull_rect,
-              bool can_apply_group_opacity);
+              const SkRect& bounds,
+              bool can_apply_group_opacity,
+              sk_sp<const DlRTree> rtree);
 
   struct SkFreeDeleter {
     void operator()(uint8_t* p) { sk_free(p); }
@@ -295,15 +284,10 @@ class DisplayList : public SkRefCnt {
 
   uint32_t unique_id_;
   SkRect bounds_;
-  sk_sp<const DlRTree> rtree_;
-
-  // Only used for drawPaint() and drawColor()
-  SkRect bounds_cull_;
 
   bool can_apply_group_opacity_;
+  sk_sp<const DlRTree> rtree_;
 
-  void ComputeBounds();
-  void ComputeRTree();
   void Dispatch(Dispatcher& ctx, uint8_t* ptr, uint8_t* end) const;
 
   friend class DisplayListBuilder;